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Classifying Schematic and Data Heterogeneity in Multidatabase Systems
December 1991 (vol. 24 no. 12)
pp. 12-18

A complete framework for enumerating and classifying the types of multidatabase system (MDBS) structural and representational discrepancies is developed. The framework is structured according to a relational database schema and is both practical and complete. It was used to build the UniSQL/M commercial multidatabase system. This MDBS was built over Structured-Query-Language-based relational database systems and a unified relational and object-oriented database system named UniSQL/X. However, the results are substantially applicable to heterogeneous database systems that use a nonrelational data model (for example, an object-oriented data model) as the common data model and allow the formulation of queries directly against the component database schemas.

Citation:
Won Kim, Jungyun Seo, "Classifying Schematic and Data Heterogeneity in Multidatabase Systems," Computer, vol. 24, no. 12, pp. 12-18, Dec. 1991, doi:10.1109/2.116884
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